Coompo Research Chemicals

The transcription factor nuclear factor-κB (NF-κB) is a key mediator of inflammation, apoptosis, invasion, and osteoclastogenesis, we investigated the effect of coronarin D on NF-κB activation pathway, NF-κB-regulated gene products, and NF-κB-regulated cellular responses. The coronarin D inhibited NF-κB activation induced by different inflammatory stimuli and carcinogens. This labdane also suppressed constitutive NF-κB activity in different cell lines and inhibited IκBα kinase activation, thus leading to the suppression of IκBα phosphorylation, degradation, p65 nuclear translocation, and reporter gene transcription. Coronarin D also inhibited the NF-κB-regulated gene products involved in cell survival (inhibitor of apoptosis protein 1, Bcl-2, survivin, and tumor necrosis factor receptor-associated factor-2), proliferation (c-myc, cyclin D1, and cyclooxygenase-2), invasion (matrix metalloproteinase-9), and angiogenesis (vascular endothelial growth factor). Suppression of these gene products by the diterpene enhanced apoptosis induced by TNF and chemotherapeutic agents, suppressed TNF-induced cellular invasion, and abrogated receptor activator of NF-κB ligand-induced osteoclastogenesis. Coronarin D was found to be more potent than its analogue coronarin D acid. Overall, our results show that coronarin D inhibited NF-κB activation pathway, which leads to inhibition of inflammation, invasion, and osteoclastogenesis, as well as potentiation of apoptosis.

Coronarin D was effective against C. albicans; the minimum inhibitory concentration (MIC) and the minimum fungicidal concentration (MFC) were 2 and 4 mg/mL, respectively. The C. albicans killing activity of coronarin D was higher than clotrimazole and nystatin at 2 × MFC and 4 × MFC, respectively. Morphologic alterations of fungal cells consistent with cell membrane damage were observed in the coronarin D-treated cells.